Hatcheries will often have specific crosses that they give fancy names to for branding purposes. Sapphire Gem, Golden Comet, Midnight Majesty Marans, etc. Usually the point of said cross is to create either a sexlink or a coloured egg layer.
Just looking at toes and skin, I'm assuming some kind of Silkie cross. I suppose a Ayam Cemani/Salmon Faverolles cross could look similar, but that's unlikely.